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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c1cc1552 CM |
2 | /* |
3 | * Based on arch/arm/mm/mmu.c | |
4 | * | |
5 | * Copyright (C) 1995-2005 Russell King | |
6 | * Copyright (C) 2012 ARM Ltd. | |
c1cc1552 CM |
7 | */ |
8 | ||
5a9e3e15 | 9 | #include <linux/cache.h> |
c1cc1552 CM |
10 | #include <linux/export.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/init.h> | |
98d2e153 TA |
14 | #include <linux/ioport.h> |
15 | #include <linux/kexec.h> | |
61bd93ce | 16 | #include <linux/libfdt.h> |
c1cc1552 CM |
17 | #include <linux/mman.h> |
18 | #include <linux/nodemask.h> | |
19 | #include <linux/memblock.h> | |
20 | #include <linux/fs.h> | |
2475ff9d | 21 | #include <linux/io.h> |
2077be67 | 22 | #include <linux/mm.h> |
6efd8499 | 23 | #include <linux/vmalloc.h> |
c1cc1552 | 24 | |
21ab99c2 | 25 | #include <asm/barrier.h> |
c1cc1552 | 26 | #include <asm/cputype.h> |
af86e597 | 27 | #include <asm/fixmap.h> |
068a17a5 | 28 | #include <asm/kasan.h> |
b433dce0 | 29 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
30 | #include <asm/sections.h> |
31 | #include <asm/setup.h> | |
87dfb311 | 32 | #include <linux/sizes.h> |
c1cc1552 CM |
33 | #include <asm/tlb.h> |
34 | #include <asm/mmu_context.h> | |
1404d6f1 | 35 | #include <asm/ptdump.h> |
ec28bb9c | 36 | #include <asm/tlbflush.h> |
c1cc1552 | 37 | |
c0951366 | 38 | #define NO_BLOCK_MAPPINGS BIT(0) |
d27cfa1f | 39 | #define NO_CONT_MAPPINGS BIT(1) |
c0951366 | 40 | |
dd006da2 | 41 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
fa2a8445 | 42 | u64 idmap_ptrs_per_pgd = PTRS_PER_PGD; |
dd006da2 | 43 | |
5383cc6e SC |
44 | u64 __section(".mmuoff.data.write") vabits_actual; |
45 | EXPORT_SYMBOL(vabits_actual); | |
dd006da2 | 46 | |
5a9e3e15 | 47 | u64 kimage_voffset __ro_after_init; |
a7f8de16 AB |
48 | EXPORT_SYMBOL(kimage_voffset); |
49 | ||
c1cc1552 CM |
50 | /* |
51 | * Empty_zero_page is a special page that is used for zero-initialized data | |
52 | * and COW. | |
53 | */ | |
5227cfa7 | 54 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
55 | EXPORT_SYMBOL(empty_zero_page); |
56 | ||
f9040773 AB |
57 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
58 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
59 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
60 | ||
2330b7ca JY |
61 | static DEFINE_SPINLOCK(swapper_pgdir_lock); |
62 | ||
63 | void set_swapper_pgd(pgd_t *pgdp, pgd_t pgd) | |
64 | { | |
65 | pgd_t *fixmap_pgdp; | |
66 | ||
67 | spin_lock(&swapper_pgdir_lock); | |
26a6f87e | 68 | fixmap_pgdp = pgd_set_fixmap(__pa_symbol(pgdp)); |
2330b7ca JY |
69 | WRITE_ONCE(*fixmap_pgdp, pgd); |
70 | /* | |
71 | * We need dsb(ishst) here to ensure the page-table-walker sees | |
72 | * our new entry before set_p?d() returns. The fixmap's | |
73 | * flush_tlb_kernel_range() via clear_fixmap() does this for us. | |
74 | */ | |
75 | pgd_clear_fixmap(); | |
76 | spin_unlock(&swapper_pgdir_lock); | |
77 | } | |
78 | ||
c1cc1552 CM |
79 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
80 | unsigned long size, pgprot_t vma_prot) | |
81 | { | |
82 | if (!pfn_valid(pfn)) | |
83 | return pgprot_noncached(vma_prot); | |
84 | else if (file->f_flags & O_SYNC) | |
85 | return pgprot_writecombine(vma_prot); | |
86 | return vma_prot; | |
87 | } | |
88 | EXPORT_SYMBOL(phys_mem_access_prot); | |
89 | ||
90292aca | 90 | static phys_addr_t __init early_pgtable_alloc(int shift) |
c1cc1552 | 91 | { |
7142392d SP |
92 | phys_addr_t phys; |
93 | void *ptr; | |
94 | ||
9a8dd708 | 95 | phys = memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); |
ecc3e771 MR |
96 | if (!phys) |
97 | panic("Failed to allocate page table page\n"); | |
f4710445 MR |
98 | |
99 | /* | |
100 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
101 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
102 | * any level of table. | |
103 | */ | |
104 | ptr = pte_set_fixmap(phys); | |
105 | ||
21ab99c2 MR |
106 | memset(ptr, 0, PAGE_SIZE); |
107 | ||
f4710445 MR |
108 | /* |
109 | * Implicit barriers also ensure the zeroed page is visible to the page | |
110 | * table walker | |
111 | */ | |
112 | pte_clear_fixmap(); | |
113 | ||
114 | return phys; | |
c1cc1552 CM |
115 | } |
116 | ||
e98216b5 AB |
117 | static bool pgattr_change_is_safe(u64 old, u64 new) |
118 | { | |
119 | /* | |
120 | * The following mapping attributes may be updated in live | |
121 | * kernel mappings without the need for break-before-make. | |
122 | */ | |
753e8abc | 123 | static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE | PTE_NG; |
e98216b5 | 124 | |
141d1497 AB |
125 | /* creating or taking down mappings is always safe */ |
126 | if (old == 0 || new == 0) | |
127 | return true; | |
128 | ||
129 | /* live contiguous mappings may not be manipulated at all */ | |
130 | if ((old | new) & PTE_CONT) | |
131 | return false; | |
132 | ||
753e8abc AB |
133 | /* Transitioning from Non-Global to Global is unsafe */ |
134 | if (old & ~new & PTE_NG) | |
135 | return false; | |
4e602056 | 136 | |
141d1497 | 137 | return ((old ^ new) & ~mask) == 0; |
e98216b5 AB |
138 | } |
139 | ||
20a004e7 | 140 | static void init_pte(pmd_t *pmdp, unsigned long addr, unsigned long end, |
d27cfa1f | 141 | phys_addr_t phys, pgprot_t prot) |
c1cc1552 | 142 | { |
20a004e7 | 143 | pte_t *ptep; |
c1cc1552 | 144 | |
20a004e7 | 145 | ptep = pte_set_fixmap_offset(pmdp, addr); |
c1cc1552 | 146 | do { |
20a004e7 | 147 | pte_t old_pte = READ_ONCE(*ptep); |
e98216b5 | 148 | |
20a004e7 | 149 | set_pte(ptep, pfn_pte(__phys_to_pfn(phys), prot)); |
e98216b5 AB |
150 | |
151 | /* | |
152 | * After the PTE entry has been populated once, we | |
153 | * only allow updates to the permission attributes. | |
154 | */ | |
20a004e7 WD |
155 | BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), |
156 | READ_ONCE(pte_val(*ptep)))); | |
e98216b5 | 157 | |
e393cf40 | 158 | phys += PAGE_SIZE; |
20a004e7 | 159 | } while (ptep++, addr += PAGE_SIZE, addr != end); |
f4710445 MR |
160 | |
161 | pte_clear_fixmap(); | |
c1cc1552 CM |
162 | } |
163 | ||
20a004e7 | 164 | static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr, |
d27cfa1f AB |
165 | unsigned long end, phys_addr_t phys, |
166 | pgprot_t prot, | |
90292aca | 167 | phys_addr_t (*pgtable_alloc)(int), |
d27cfa1f | 168 | int flags) |
c1cc1552 | 169 | { |
c1cc1552 | 170 | unsigned long next; |
20a004e7 | 171 | pmd_t pmd = READ_ONCE(*pmdp); |
c1cc1552 | 172 | |
20a004e7 WD |
173 | BUG_ON(pmd_sect(pmd)); |
174 | if (pmd_none(pmd)) { | |
d27cfa1f | 175 | phys_addr_t pte_phys; |
132233a7 | 176 | BUG_ON(!pgtable_alloc); |
90292aca | 177 | pte_phys = pgtable_alloc(PAGE_SHIFT); |
20a004e7 WD |
178 | __pmd_populate(pmdp, pte_phys, PMD_TYPE_TABLE); |
179 | pmd = READ_ONCE(*pmdp); | |
c1cc1552 | 180 | } |
20a004e7 | 181 | BUG_ON(pmd_bad(pmd)); |
d27cfa1f AB |
182 | |
183 | do { | |
184 | pgprot_t __prot = prot; | |
185 | ||
186 | next = pte_cont_addr_end(addr, end); | |
187 | ||
188 | /* use a contiguous mapping if the range is suitably aligned */ | |
189 | if ((((addr | next | phys) & ~CONT_PTE_MASK) == 0) && | |
190 | (flags & NO_CONT_MAPPINGS) == 0) | |
191 | __prot = __pgprot(pgprot_val(prot) | PTE_CONT); | |
192 | ||
20a004e7 | 193 | init_pte(pmdp, addr, next, phys, __prot); |
d27cfa1f AB |
194 | |
195 | phys += next - addr; | |
196 | } while (addr = next, addr != end); | |
197 | } | |
198 | ||
20a004e7 | 199 | static void init_pmd(pud_t *pudp, unsigned long addr, unsigned long end, |
d27cfa1f | 200 | phys_addr_t phys, pgprot_t prot, |
90292aca | 201 | phys_addr_t (*pgtable_alloc)(int), int flags) |
d27cfa1f AB |
202 | { |
203 | unsigned long next; | |
20a004e7 | 204 | pmd_t *pmdp; |
c1cc1552 | 205 | |
20a004e7 | 206 | pmdp = pmd_set_fixmap_offset(pudp, addr); |
c1cc1552 | 207 | do { |
20a004e7 | 208 | pmd_t old_pmd = READ_ONCE(*pmdp); |
e98216b5 | 209 | |
c1cc1552 | 210 | next = pmd_addr_end(addr, end); |
e98216b5 | 211 | |
c1cc1552 | 212 | /* try section mapping first */ |
83863f25 | 213 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
c0951366 | 214 | (flags & NO_BLOCK_MAPPINGS) == 0) { |
20a004e7 | 215 | pmd_set_huge(pmdp, phys, prot); |
e98216b5 | 216 | |
a55f9929 | 217 | /* |
e98216b5 AB |
218 | * After the PMD entry has been populated once, we |
219 | * only allow updates to the permission attributes. | |
a55f9929 | 220 | */ |
e98216b5 | 221 | BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd), |
20a004e7 | 222 | READ_ONCE(pmd_val(*pmdp)))); |
a55f9929 | 223 | } else { |
20a004e7 | 224 | alloc_init_cont_pte(pmdp, addr, next, phys, prot, |
d27cfa1f | 225 | pgtable_alloc, flags); |
e98216b5 AB |
226 | |
227 | BUG_ON(pmd_val(old_pmd) != 0 && | |
20a004e7 | 228 | pmd_val(old_pmd) != READ_ONCE(pmd_val(*pmdp))); |
a55f9929 | 229 | } |
c1cc1552 | 230 | phys += next - addr; |
20a004e7 | 231 | } while (pmdp++, addr = next, addr != end); |
f4710445 MR |
232 | |
233 | pmd_clear_fixmap(); | |
c1cc1552 CM |
234 | } |
235 | ||
20a004e7 | 236 | static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr, |
d27cfa1f AB |
237 | unsigned long end, phys_addr_t phys, |
238 | pgprot_t prot, | |
90292aca | 239 | phys_addr_t (*pgtable_alloc)(int), int flags) |
d27cfa1f AB |
240 | { |
241 | unsigned long next; | |
20a004e7 | 242 | pud_t pud = READ_ONCE(*pudp); |
d27cfa1f AB |
243 | |
244 | /* | |
245 | * Check for initial section mappings in the pgd/pud. | |
246 | */ | |
20a004e7 WD |
247 | BUG_ON(pud_sect(pud)); |
248 | if (pud_none(pud)) { | |
d27cfa1f AB |
249 | phys_addr_t pmd_phys; |
250 | BUG_ON(!pgtable_alloc); | |
90292aca | 251 | pmd_phys = pgtable_alloc(PMD_SHIFT); |
20a004e7 WD |
252 | __pud_populate(pudp, pmd_phys, PUD_TYPE_TABLE); |
253 | pud = READ_ONCE(*pudp); | |
d27cfa1f | 254 | } |
20a004e7 | 255 | BUG_ON(pud_bad(pud)); |
d27cfa1f AB |
256 | |
257 | do { | |
258 | pgprot_t __prot = prot; | |
259 | ||
260 | next = pmd_cont_addr_end(addr, end); | |
261 | ||
262 | /* use a contiguous mapping if the range is suitably aligned */ | |
263 | if ((((addr | next | phys) & ~CONT_PMD_MASK) == 0) && | |
264 | (flags & NO_CONT_MAPPINGS) == 0) | |
265 | __prot = __pgprot(pgprot_val(prot) | PTE_CONT); | |
266 | ||
20a004e7 | 267 | init_pmd(pudp, addr, next, phys, __prot, pgtable_alloc, flags); |
d27cfa1f AB |
268 | |
269 | phys += next - addr; | |
270 | } while (addr = next, addr != end); | |
271 | } | |
272 | ||
da141706 LA |
273 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
274 | unsigned long phys) | |
275 | { | |
276 | if (PAGE_SHIFT != 12) | |
277 | return false; | |
278 | ||
279 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
280 | return false; | |
281 | ||
282 | return true; | |
283 | } | |
284 | ||
20a004e7 WD |
285 | static void alloc_init_pud(pgd_t *pgdp, unsigned long addr, unsigned long end, |
286 | phys_addr_t phys, pgprot_t prot, | |
90292aca | 287 | phys_addr_t (*pgtable_alloc)(int), |
20a004e7 | 288 | int flags) |
c1cc1552 | 289 | { |
c1cc1552 | 290 | unsigned long next; |
20a004e7 WD |
291 | pud_t *pudp; |
292 | pgd_t pgd = READ_ONCE(*pgdp); | |
c1cc1552 | 293 | |
20a004e7 | 294 | if (pgd_none(pgd)) { |
132233a7 LA |
295 | phys_addr_t pud_phys; |
296 | BUG_ON(!pgtable_alloc); | |
90292aca | 297 | pud_phys = pgtable_alloc(PUD_SHIFT); |
20a004e7 WD |
298 | __pgd_populate(pgdp, pud_phys, PUD_TYPE_TABLE); |
299 | pgd = READ_ONCE(*pgdp); | |
c79b954b | 300 | } |
20a004e7 | 301 | BUG_ON(pgd_bad(pgd)); |
c79b954b | 302 | |
20a004e7 | 303 | pudp = pud_set_fixmap_offset(pgdp, addr); |
c1cc1552 | 304 | do { |
20a004e7 | 305 | pud_t old_pud = READ_ONCE(*pudp); |
e98216b5 | 306 | |
c1cc1552 | 307 | next = pud_addr_end(addr, end); |
206a2a73 SC |
308 | |
309 | /* | |
310 | * For 4K granule only, attempt to put down a 1GB block | |
311 | */ | |
c0951366 AB |
312 | if (use_1G_block(addr, next, phys) && |
313 | (flags & NO_BLOCK_MAPPINGS) == 0) { | |
20a004e7 | 314 | pud_set_huge(pudp, phys, prot); |
206a2a73 SC |
315 | |
316 | /* | |
e98216b5 AB |
317 | * After the PUD entry has been populated once, we |
318 | * only allow updates to the permission attributes. | |
206a2a73 | 319 | */ |
e98216b5 | 320 | BUG_ON(!pgattr_change_is_safe(pud_val(old_pud), |
20a004e7 | 321 | READ_ONCE(pud_val(*pudp)))); |
206a2a73 | 322 | } else { |
20a004e7 | 323 | alloc_init_cont_pmd(pudp, addr, next, phys, prot, |
d27cfa1f | 324 | pgtable_alloc, flags); |
e98216b5 AB |
325 | |
326 | BUG_ON(pud_val(old_pud) != 0 && | |
20a004e7 | 327 | pud_val(old_pud) != READ_ONCE(pud_val(*pudp))); |
206a2a73 | 328 | } |
c1cc1552 | 329 | phys += next - addr; |
20a004e7 | 330 | } while (pudp++, addr = next, addr != end); |
f4710445 MR |
331 | |
332 | pud_clear_fixmap(); | |
c1cc1552 CM |
333 | } |
334 | ||
40f87d31 AB |
335 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
336 | unsigned long virt, phys_addr_t size, | |
337 | pgprot_t prot, | |
90292aca | 338 | phys_addr_t (*pgtable_alloc)(int), |
c0951366 | 339 | int flags) |
c1cc1552 CM |
340 | { |
341 | unsigned long addr, length, end, next; | |
20a004e7 | 342 | pgd_t *pgdp = pgd_offset_raw(pgdir, virt); |
c1cc1552 | 343 | |
cc5d2b3b MR |
344 | /* |
345 | * If the virtual and physical address don't have the same offset | |
346 | * within a page, we cannot map the region as the caller expects. | |
347 | */ | |
348 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
349 | return; | |
350 | ||
9c4e08a3 | 351 | phys &= PAGE_MASK; |
c1cc1552 CM |
352 | addr = virt & PAGE_MASK; |
353 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
354 | ||
c1cc1552 CM |
355 | end = addr + length; |
356 | do { | |
357 | next = pgd_addr_end(addr, end); | |
20a004e7 | 358 | alloc_init_pud(pgdp, addr, next, phys, prot, pgtable_alloc, |
c0951366 | 359 | flags); |
c1cc1552 | 360 | phys += next - addr; |
20a004e7 | 361 | } while (pgdp++, addr = next, addr != end); |
c1cc1552 CM |
362 | } |
363 | ||
475ba3fc | 364 | static phys_addr_t __pgd_pgtable_alloc(int shift) |
369aaab8 | 365 | { |
50f11a8a | 366 | void *ptr = (void *)__get_free_page(GFP_PGTABLE_KERNEL); |
369aaab8 YZ |
367 | BUG_ON(!ptr); |
368 | ||
369 | /* Ensure the zeroed page is visible to the page table walker */ | |
370 | dsb(ishst); | |
371 | return __pa(ptr); | |
372 | } | |
373 | ||
90292aca | 374 | static phys_addr_t pgd_pgtable_alloc(int shift) |
da141706 | 375 | { |
475ba3fc | 376 | phys_addr_t pa = __pgd_pgtable_alloc(shift); |
90292aca YZ |
377 | |
378 | /* | |
379 | * Call proper page table ctor in case later we need to | |
380 | * call core mm functions like apply_to_page_range() on | |
381 | * this pre-allocated page table. | |
382 | * | |
383 | * We don't select ARCH_ENABLE_SPLIT_PMD_PTLOCK if pmd is | |
384 | * folded, and if so pgtable_pmd_page_ctor() becomes nop. | |
385 | */ | |
386 | if (shift == PAGE_SHIFT) | |
b4ed71f5 | 387 | BUG_ON(!pgtable_pte_page_ctor(phys_to_page(pa))); |
90292aca | 388 | else if (shift == PMD_SHIFT) |
475ba3fc | 389 | BUG_ON(!pgtable_pmd_page_ctor(phys_to_page(pa))); |
21ab99c2 | 390 | |
475ba3fc | 391 | return pa; |
da141706 LA |
392 | } |
393 | ||
132233a7 LA |
394 | /* |
395 | * This function can only be used to modify existing table entries, | |
396 | * without allocating new levels of table. Note that this permits the | |
397 | * creation of new section or page entries. | |
398 | */ | |
399 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 400 | phys_addr_t size, pgprot_t prot) |
d7ecbddf | 401 | { |
77ad4ce6 | 402 | if ((virt >= PAGE_END) && (virt < VMALLOC_START)) { |
d7ecbddf MS |
403 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", |
404 | &phys, virt); | |
405 | return; | |
406 | } | |
d27cfa1f AB |
407 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, |
408 | NO_CONT_MAPPINGS); | |
d7ecbddf MS |
409 | } |
410 | ||
8ce837ce AB |
411 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
412 | unsigned long virt, phys_addr_t size, | |
f14c66ce | 413 | pgprot_t prot, bool page_mappings_only) |
8ce837ce | 414 | { |
c0951366 AB |
415 | int flags = 0; |
416 | ||
1378dc3d AB |
417 | BUG_ON(mm == &init_mm); |
418 | ||
c0951366 | 419 | if (page_mappings_only) |
d27cfa1f | 420 | flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; |
c0951366 | 421 | |
11509a30 | 422 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
c0951366 | 423 | pgd_pgtable_alloc, flags); |
d7ecbddf MS |
424 | } |
425 | ||
aa8c09be AB |
426 | static void update_mapping_prot(phys_addr_t phys, unsigned long virt, |
427 | phys_addr_t size, pgprot_t prot) | |
da141706 | 428 | { |
77ad4ce6 | 429 | if ((virt >= PAGE_END) && (virt < VMALLOC_START)) { |
aa8c09be | 430 | pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n", |
da141706 LA |
431 | &phys, virt); |
432 | return; | |
433 | } | |
434 | ||
d27cfa1f AB |
435 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, |
436 | NO_CONT_MAPPINGS); | |
aa8c09be AB |
437 | |
438 | /* flush the TLBs after updating live kernel mappings */ | |
439 | flush_tlb_kernel_range(virt, virt + size); | |
da141706 LA |
440 | } |
441 | ||
20a004e7 | 442 | static void __init __map_memblock(pgd_t *pgdp, phys_addr_t start, |
98d2e153 TA |
443 | phys_addr_t end, pgprot_t prot, int flags) |
444 | { | |
20a004e7 | 445 | __create_pgd_mapping(pgdp, start, __phys_to_virt(start), end - start, |
98d2e153 TA |
446 | prot, early_pgtable_alloc, flags); |
447 | } | |
448 | ||
449 | void __init mark_linear_text_alias_ro(void) | |
450 | { | |
451 | /* | |
452 | * Remove the write permissions from the linear alias of .text/.rodata | |
453 | */ | |
454 | update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text), | |
455 | (unsigned long)__init_begin - (unsigned long)_text, | |
456 | PAGE_KERNEL_RO); | |
457 | } | |
458 | ||
20a004e7 | 459 | static void __init map_mem(pgd_t *pgdp) |
da141706 | 460 | { |
eac8017f MC |
461 | phys_addr_t kernel_start = __pa_symbol(_text); |
462 | phys_addr_t kernel_end = __pa_symbol(__init_begin); | |
98d2e153 | 463 | struct memblock_region *reg; |
c0951366 AB |
464 | int flags = 0; |
465 | ||
c55191e9 | 466 | if (rodata_full || debug_pagealloc_enabled()) |
d27cfa1f | 467 | flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; |
068a17a5 | 468 | |
da141706 | 469 | /* |
f9040773 AB |
470 | * Take care not to create a writable alias for the |
471 | * read-only text and rodata sections of the kernel image. | |
98d2e153 TA |
472 | * So temporarily mark them as NOMAP to skip mappings in |
473 | * the following for-loop | |
da141706 | 474 | */ |
98d2e153 TA |
475 | memblock_mark_nomap(kernel_start, kernel_end - kernel_start); |
476 | #ifdef CONFIG_KEXEC_CORE | |
477 | if (crashk_res.end) | |
478 | memblock_mark_nomap(crashk_res.start, | |
479 | resource_size(&crashk_res)); | |
480 | #endif | |
068a17a5 | 481 | |
98d2e153 TA |
482 | /* map all the memory banks */ |
483 | for_each_memblock(memory, reg) { | |
484 | phys_addr_t start = reg->base; | |
485 | phys_addr_t end = start + reg->size; | |
da141706 | 486 | |
98d2e153 TA |
487 | if (start >= end) |
488 | break; | |
489 | if (memblock_is_nomap(reg)) | |
490 | continue; | |
491 | ||
20a004e7 | 492 | __map_memblock(pgdp, start, end, PAGE_KERNEL, flags); |
98d2e153 | 493 | } |
f9040773 AB |
494 | |
495 | /* | |
5ea5306c AB |
496 | * Map the linear alias of the [_text, __init_begin) interval |
497 | * as non-executable now, and remove the write permission in | |
498 | * mark_linear_text_alias_ro() below (which will be called after | |
499 | * alternative patching has completed). This makes the contents | |
500 | * of the region accessible to subsystems such as hibernate, | |
501 | * but protects it from inadvertent modification or execution. | |
d27cfa1f AB |
502 | * Note that contiguous mappings cannot be remapped in this way, |
503 | * so we should avoid them here. | |
f9040773 | 504 | */ |
20a004e7 | 505 | __map_memblock(pgdp, kernel_start, kernel_end, |
98d2e153 TA |
506 | PAGE_KERNEL, NO_CONT_MAPPINGS); |
507 | memblock_clear_nomap(kernel_start, kernel_end - kernel_start); | |
da141706 | 508 | |
98d2e153 | 509 | #ifdef CONFIG_KEXEC_CORE |
5ea5306c | 510 | /* |
98d2e153 TA |
511 | * Use page-level mappings here so that we can shrink the region |
512 | * in page granularity and put back unused memory to buddy system | |
513 | * through /sys/kernel/kexec_crash_size interface. | |
5ea5306c | 514 | */ |
98d2e153 | 515 | if (crashk_res.end) { |
20a004e7 | 516 | __map_memblock(pgdp, crashk_res.start, crashk_res.end + 1, |
98d2e153 TA |
517 | PAGE_KERNEL, |
518 | NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS); | |
519 | memblock_clear_nomap(crashk_res.start, | |
520 | resource_size(&crashk_res)); | |
c1cc1552 | 521 | } |
98d2e153 | 522 | #endif |
c1cc1552 CM |
523 | } |
524 | ||
da141706 LA |
525 | void mark_rodata_ro(void) |
526 | { | |
2f39b5f9 | 527 | unsigned long section_size; |
f9040773 | 528 | |
2f39b5f9 | 529 | /* |
9fdc14c5 AB |
530 | * mark .rodata as read only. Use __init_begin rather than __end_rodata |
531 | * to cover NOTES and EXCEPTION_TABLE. | |
2f39b5f9 | 532 | */ |
9fdc14c5 | 533 | section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata; |
aa8c09be | 534 | update_mapping_prot(__pa_symbol(__start_rodata), (unsigned long)__start_rodata, |
2f39b5f9 | 535 | section_size, PAGE_KERNEL_RO); |
e98216b5 | 536 | |
1404d6f1 | 537 | debug_checkwx(); |
da141706 | 538 | } |
da141706 | 539 | |
20a004e7 | 540 | static void __init map_kernel_segment(pgd_t *pgdp, void *va_start, void *va_end, |
d27cfa1f | 541 | pgprot_t prot, struct vm_struct *vma, |
92bbd16e | 542 | int flags, unsigned long vm_flags) |
068a17a5 | 543 | { |
2077be67 | 544 | phys_addr_t pa_start = __pa_symbol(va_start); |
068a17a5 MR |
545 | unsigned long size = va_end - va_start; |
546 | ||
547 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
548 | BUG_ON(!PAGE_ALIGNED(size)); | |
549 | ||
20a004e7 | 550 | __create_pgd_mapping(pgdp, pa_start, (unsigned long)va_start, size, prot, |
d27cfa1f | 551 | early_pgtable_alloc, flags); |
f9040773 | 552 | |
92bbd16e WD |
553 | if (!(vm_flags & VM_NO_GUARD)) |
554 | size += PAGE_SIZE; | |
555 | ||
f9040773 AB |
556 | vma->addr = va_start; |
557 | vma->phys_addr = pa_start; | |
558 | vma->size = size; | |
92bbd16e | 559 | vma->flags = VM_MAP | vm_flags; |
f9040773 AB |
560 | vma->caller = __builtin_return_address(0); |
561 | ||
562 | vm_area_add_early(vma); | |
068a17a5 MR |
563 | } |
564 | ||
28b066da AB |
565 | static int __init parse_rodata(char *arg) |
566 | { | |
c55191e9 AB |
567 | int ret = strtobool(arg, &rodata_enabled); |
568 | if (!ret) { | |
569 | rodata_full = false; | |
570 | return 0; | |
571 | } | |
572 | ||
573 | /* permit 'full' in addition to boolean options */ | |
574 | if (strcmp(arg, "full")) | |
575 | return -EINVAL; | |
576 | ||
577 | rodata_enabled = true; | |
578 | rodata_full = true; | |
579 | return 0; | |
28b066da AB |
580 | } |
581 | early_param("rodata", parse_rodata); | |
582 | ||
51a0048b WD |
583 | #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 |
584 | static int __init map_entry_trampoline(void) | |
585 | { | |
51a0048b WD |
586 | pgprot_t prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; |
587 | phys_addr_t pa_start = __pa_symbol(__entry_tramp_text_start); | |
588 | ||
589 | /* The trampoline is always mapped and can therefore be global */ | |
590 | pgprot_val(prot) &= ~PTE_NG; | |
591 | ||
592 | /* Map only the text into the trampoline page table */ | |
593 | memset(tramp_pg_dir, 0, PGD_SIZE); | |
594 | __create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS, PAGE_SIZE, | |
475ba3fc | 595 | prot, __pgd_pgtable_alloc, 0); |
51a0048b | 596 | |
6c27c408 | 597 | /* Map both the text and data into the kernel page table */ |
51a0048b | 598 | __set_fixmap(FIX_ENTRY_TRAMP_TEXT, pa_start, prot); |
6c27c408 WD |
599 | if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) { |
600 | extern char __entry_tramp_data_start[]; | |
601 | ||
602 | __set_fixmap(FIX_ENTRY_TRAMP_DATA, | |
603 | __pa_symbol(__entry_tramp_data_start), | |
604 | PAGE_KERNEL_RO); | |
605 | } | |
606 | ||
51a0048b WD |
607 | return 0; |
608 | } | |
609 | core_initcall(map_entry_trampoline); | |
610 | #endif | |
611 | ||
068a17a5 MR |
612 | /* |
613 | * Create fine-grained mappings for the kernel. | |
614 | */ | |
20a004e7 | 615 | static void __init map_kernel(pgd_t *pgdp) |
068a17a5 | 616 | { |
2ebe088b AB |
617 | static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext, |
618 | vmlinux_initdata, vmlinux_data; | |
068a17a5 | 619 | |
28b066da AB |
620 | /* |
621 | * External debuggers may need to write directly to the text | |
622 | * mapping to install SW breakpoints. Allow this (only) when | |
623 | * explicitly requested with rodata=off. | |
624 | */ | |
625 | pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; | |
626 | ||
d27cfa1f AB |
627 | /* |
628 | * Only rodata will be remapped with different permissions later on, | |
629 | * all other segments are allowed to use contiguous mappings. | |
630 | */ | |
20a004e7 | 631 | map_kernel_segment(pgdp, _text, _etext, text_prot, &vmlinux_text, 0, |
92bbd16e | 632 | VM_NO_GUARD); |
20a004e7 | 633 | map_kernel_segment(pgdp, __start_rodata, __inittext_begin, PAGE_KERNEL, |
92bbd16e | 634 | &vmlinux_rodata, NO_CONT_MAPPINGS, VM_NO_GUARD); |
20a004e7 | 635 | map_kernel_segment(pgdp, __inittext_begin, __inittext_end, text_prot, |
92bbd16e | 636 | &vmlinux_inittext, 0, VM_NO_GUARD); |
20a004e7 | 637 | map_kernel_segment(pgdp, __initdata_begin, __initdata_end, PAGE_KERNEL, |
92bbd16e | 638 | &vmlinux_initdata, 0, VM_NO_GUARD); |
20a004e7 | 639 | map_kernel_segment(pgdp, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0); |
068a17a5 | 640 | |
20a004e7 | 641 | if (!READ_ONCE(pgd_val(*pgd_offset_raw(pgdp, FIXADDR_START)))) { |
f9040773 AB |
642 | /* |
643 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
644 | * live in the carveout for the swapper_pg_dir. We can simply | |
645 | * re-use the existing dir for the fixmap. | |
646 | */ | |
20a004e7 WD |
647 | set_pgd(pgd_offset_raw(pgdp, FIXADDR_START), |
648 | READ_ONCE(*pgd_offset_k(FIXADDR_START))); | |
f9040773 | 649 | } else if (CONFIG_PGTABLE_LEVELS > 3) { |
b333b0ba MR |
650 | pgd_t *bm_pgdp; |
651 | pud_t *bm_pudp; | |
f9040773 AB |
652 | /* |
653 | * The fixmap shares its top level pgd entry with the kernel | |
654 | * mapping. This can really only occur when we are running | |
655 | * with 16k/4 levels, so we can simply reuse the pud level | |
656 | * entry instead. | |
657 | */ | |
658 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
b333b0ba MR |
659 | bm_pgdp = pgd_offset_raw(pgdp, FIXADDR_START); |
660 | bm_pudp = pud_set_fixmap_offset(bm_pgdp, FIXADDR_START); | |
661 | pud_populate(&init_mm, bm_pudp, lm_alias(bm_pmd)); | |
f9040773 AB |
662 | pud_clear_fixmap(); |
663 | } else { | |
664 | BUG(); | |
665 | } | |
068a17a5 | 666 | |
20a004e7 | 667 | kasan_copy_shadow(pgdp); |
068a17a5 MR |
668 | } |
669 | ||
c1cc1552 CM |
670 | void __init paging_init(void) |
671 | { | |
2330b7ca | 672 | pgd_t *pgdp = pgd_set_fixmap(__pa_symbol(swapper_pg_dir)); |
068a17a5 | 673 | |
20a004e7 WD |
674 | map_kernel(pgdp); |
675 | map_mem(pgdp); | |
068a17a5 | 676 | |
068a17a5 | 677 | pgd_clear_fixmap(); |
068a17a5 | 678 | |
2077be67 | 679 | cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); |
2b5548b6 | 680 | init_mm.pgd = swapper_pg_dir; |
068a17a5 | 681 | |
2b5548b6 JY |
682 | memblock_free(__pa_symbol(init_pg_dir), |
683 | __pa_symbol(init_pg_end) - __pa_symbol(init_pg_dir)); | |
24cc61d8 AB |
684 | |
685 | memblock_allow_resize(); | |
c1cc1552 CM |
686 | } |
687 | ||
c1cc1552 CM |
688 | /* |
689 | * Check whether a kernel address is valid (derived from arch/x86/). | |
690 | */ | |
691 | int kern_addr_valid(unsigned long addr) | |
692 | { | |
20a004e7 WD |
693 | pgd_t *pgdp; |
694 | pud_t *pudp, pud; | |
695 | pmd_t *pmdp, pmd; | |
696 | pte_t *ptep, pte; | |
c1cc1552 CM |
697 | |
698 | if ((((long)addr) >> VA_BITS) != -1UL) | |
699 | return 0; | |
700 | ||
20a004e7 WD |
701 | pgdp = pgd_offset_k(addr); |
702 | if (pgd_none(READ_ONCE(*pgdp))) | |
c1cc1552 CM |
703 | return 0; |
704 | ||
20a004e7 WD |
705 | pudp = pud_offset(pgdp, addr); |
706 | pud = READ_ONCE(*pudp); | |
707 | if (pud_none(pud)) | |
c1cc1552 CM |
708 | return 0; |
709 | ||
20a004e7 WD |
710 | if (pud_sect(pud)) |
711 | return pfn_valid(pud_pfn(pud)); | |
206a2a73 | 712 | |
20a004e7 WD |
713 | pmdp = pmd_offset(pudp, addr); |
714 | pmd = READ_ONCE(*pmdp); | |
715 | if (pmd_none(pmd)) | |
c1cc1552 CM |
716 | return 0; |
717 | ||
20a004e7 WD |
718 | if (pmd_sect(pmd)) |
719 | return pfn_valid(pmd_pfn(pmd)); | |
da6e4cb6 | 720 | |
20a004e7 WD |
721 | ptep = pte_offset_kernel(pmdp, addr); |
722 | pte = READ_ONCE(*ptep); | |
723 | if (pte_none(pte)) | |
c1cc1552 CM |
724 | return 0; |
725 | ||
20a004e7 | 726 | return pfn_valid(pte_pfn(pte)); |
c1cc1552 CM |
727 | } |
728 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 729 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
7b73d978 CH |
730 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, |
731 | struct vmem_altmap *altmap) | |
c1cc1552 | 732 | { |
0aad818b | 733 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 734 | } |
b433dce0 | 735 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
7b73d978 CH |
736 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, |
737 | struct vmem_altmap *altmap) | |
c1cc1552 | 738 | { |
0aad818b | 739 | unsigned long addr = start; |
c1cc1552 | 740 | unsigned long next; |
20a004e7 WD |
741 | pgd_t *pgdp; |
742 | pud_t *pudp; | |
743 | pmd_t *pmdp; | |
c1cc1552 CM |
744 | |
745 | do { | |
746 | next = pmd_addr_end(addr, end); | |
747 | ||
20a004e7 WD |
748 | pgdp = vmemmap_pgd_populate(addr, node); |
749 | if (!pgdp) | |
c1cc1552 CM |
750 | return -ENOMEM; |
751 | ||
20a004e7 WD |
752 | pudp = vmemmap_pud_populate(pgdp, addr, node); |
753 | if (!pudp) | |
c1cc1552 CM |
754 | return -ENOMEM; |
755 | ||
20a004e7 WD |
756 | pmdp = pmd_offset(pudp, addr); |
757 | if (pmd_none(READ_ONCE(*pmdp))) { | |
c1cc1552 CM |
758 | void *p = NULL; |
759 | ||
760 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
761 | if (!p) | |
762 | return -ENOMEM; | |
763 | ||
20a004e7 | 764 | pmd_set_huge(pmdp, __pa(p), __pgprot(PROT_SECT_NORMAL)); |
c1cc1552 | 765 | } else |
20a004e7 | 766 | vmemmap_verify((pte_t *)pmdp, node, addr, next); |
c1cc1552 CM |
767 | } while (addr = next, addr != end); |
768 | ||
769 | return 0; | |
770 | } | |
8e01076a | 771 | #endif /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
24b6d416 CH |
772 | void vmemmap_free(unsigned long start, unsigned long end, |
773 | struct vmem_altmap *altmap) | |
0197518c TC |
774 | { |
775 | } | |
c1cc1552 | 776 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 777 | |
af86e597 LA |
778 | static inline pud_t * fixmap_pud(unsigned long addr) |
779 | { | |
20a004e7 WD |
780 | pgd_t *pgdp = pgd_offset_k(addr); |
781 | pgd_t pgd = READ_ONCE(*pgdp); | |
af86e597 | 782 | |
20a004e7 | 783 | BUG_ON(pgd_none(pgd) || pgd_bad(pgd)); |
af86e597 | 784 | |
20a004e7 | 785 | return pud_offset_kimg(pgdp, addr); |
af86e597 LA |
786 | } |
787 | ||
788 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
789 | { | |
20a004e7 WD |
790 | pud_t *pudp = fixmap_pud(addr); |
791 | pud_t pud = READ_ONCE(*pudp); | |
af86e597 | 792 | |
20a004e7 | 793 | BUG_ON(pud_none(pud) || pud_bad(pud)); |
af86e597 | 794 | |
20a004e7 | 795 | return pmd_offset_kimg(pudp, addr); |
af86e597 LA |
796 | } |
797 | ||
798 | static inline pte_t * fixmap_pte(unsigned long addr) | |
799 | { | |
157962f5 | 800 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
801 | } |
802 | ||
2077be67 LA |
803 | /* |
804 | * The p*d_populate functions call virt_to_phys implicitly so they can't be used | |
805 | * directly on kernel symbols (bm_p*d). This function is called too early to use | |
806 | * lm_alias so __p*d_populate functions must be used to populate with the | |
807 | * physical address from __pa_symbol. | |
808 | */ | |
af86e597 LA |
809 | void __init early_fixmap_init(void) |
810 | { | |
20a004e7 WD |
811 | pgd_t *pgdp, pgd; |
812 | pud_t *pudp; | |
813 | pmd_t *pmdp; | |
af86e597 LA |
814 | unsigned long addr = FIXADDR_START; |
815 | ||
20a004e7 WD |
816 | pgdp = pgd_offset_k(addr); |
817 | pgd = READ_ONCE(*pgdp); | |
f80fb3a3 | 818 | if (CONFIG_PGTABLE_LEVELS > 3 && |
20a004e7 | 819 | !(pgd_none(pgd) || pgd_page_paddr(pgd) == __pa_symbol(bm_pud))) { |
f9040773 AB |
820 | /* |
821 | * We only end up here if the kernel mapping and the fixmap | |
822 | * share the top level pgd entry, which should only happen on | |
823 | * 16k/4 levels configurations. | |
824 | */ | |
825 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
20a004e7 | 826 | pudp = pud_offset_kimg(pgdp, addr); |
f9040773 | 827 | } else { |
20a004e7 WD |
828 | if (pgd_none(pgd)) |
829 | __pgd_populate(pgdp, __pa_symbol(bm_pud), PUD_TYPE_TABLE); | |
830 | pudp = fixmap_pud(addr); | |
f9040773 | 831 | } |
20a004e7 WD |
832 | if (pud_none(READ_ONCE(*pudp))) |
833 | __pud_populate(pudp, __pa_symbol(bm_pmd), PMD_TYPE_TABLE); | |
834 | pmdp = fixmap_pmd(addr); | |
835 | __pmd_populate(pmdp, __pa_symbol(bm_pte), PMD_TYPE_TABLE); | |
af86e597 LA |
836 | |
837 | /* | |
838 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 839 | * we are not prepared: |
af86e597 LA |
840 | */ |
841 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
842 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
843 | ||
20a004e7 WD |
844 | if ((pmdp != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) |
845 | || pmdp != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
af86e597 | 846 | WARN_ON(1); |
20a004e7 WD |
847 | pr_warn("pmdp %p != %p, %p\n", |
848 | pmdp, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
af86e597 LA |
849 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); |
850 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
851 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
852 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
853 | fix_to_virt(FIX_BTMAP_END)); | |
854 | ||
855 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
856 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
857 | } | |
858 | } | |
859 | ||
18b4b276 JM |
860 | /* |
861 | * Unusually, this is also called in IRQ context (ghes_iounmap_irq) so if we | |
862 | * ever need to use IPIs for TLB broadcasting, then we're in trouble here. | |
863 | */ | |
af86e597 LA |
864 | void __set_fixmap(enum fixed_addresses idx, |
865 | phys_addr_t phys, pgprot_t flags) | |
866 | { | |
867 | unsigned long addr = __fix_to_virt(idx); | |
20a004e7 | 868 | pte_t *ptep; |
af86e597 | 869 | |
b63dbef9 | 870 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 | 871 | |
20a004e7 | 872 | ptep = fixmap_pte(addr); |
af86e597 LA |
873 | |
874 | if (pgprot_val(flags)) { | |
20a004e7 | 875 | set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags)); |
af86e597 | 876 | } else { |
20a004e7 | 877 | pte_clear(&init_mm, addr, ptep); |
af86e597 LA |
878 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); |
879 | } | |
880 | } | |
61bd93ce | 881 | |
e112b032 | 882 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
883 | { |
884 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 885 | int offset; |
61bd93ce AB |
886 | void *dt_virt; |
887 | ||
888 | /* | |
889 | * Check whether the physical FDT address is set and meets the minimum | |
890 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
04a84810 AB |
891 | * at least 8 bytes so that we can always access the magic and size |
892 | * fields of the FDT header after mapping the first chunk, double check | |
893 | * here if that is indeed the case. | |
61bd93ce AB |
894 | */ |
895 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
896 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
897 | return NULL; | |
898 | ||
899 | /* | |
900 | * Make sure that the FDT region can be mapped without the need to | |
901 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 902 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
903 | * |
904 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
905 | * be in the same PMD as the rest of the fixmap. | |
906 | * On 4k pages, we'll use section mappings for the FDT so we only | |
907 | * have to be in the same PUD. | |
908 | */ | |
909 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
910 | ||
b433dce0 SP |
911 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
912 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 913 | |
b433dce0 | 914 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
915 | dt_virt = (void *)dt_virt_base + offset; |
916 | ||
917 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
918 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
919 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce | 920 | |
04a84810 | 921 | if (fdt_magic(dt_virt) != FDT_MAGIC) |
61bd93ce AB |
922 | return NULL; |
923 | ||
f80fb3a3 AB |
924 | *size = fdt_totalsize(dt_virt); |
925 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
926 | return NULL; |
927 | ||
f80fb3a3 | 928 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 929 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 930 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 931 | |
f80fb3a3 AB |
932 | return dt_virt; |
933 | } | |
61bd93ce | 934 | |
0f472d04 AK |
935 | int __init arch_ioremap_p4d_supported(void) |
936 | { | |
937 | return 0; | |
938 | } | |
939 | ||
324420bf AB |
940 | int __init arch_ioremap_pud_supported(void) |
941 | { | |
7ba36ecc MR |
942 | /* |
943 | * Only 4k granule supports level 1 block mappings. | |
944 | * SW table walks can't handle removal of intermediate entries. | |
945 | */ | |
946 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES) && | |
947 | !IS_ENABLED(CONFIG_ARM64_PTDUMP_DEBUGFS); | |
324420bf AB |
948 | } |
949 | ||
950 | int __init arch_ioremap_pmd_supported(void) | |
951 | { | |
7ba36ecc MR |
952 | /* See arch_ioremap_pud_supported() */ |
953 | return !IS_ENABLED(CONFIG_ARM64_PTDUMP_DEBUGFS); | |
324420bf AB |
954 | } |
955 | ||
20a004e7 | 956 | int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot) |
324420bf | 957 | { |
f7f0097a | 958 | pud_t new_pud = pfn_pud(__phys_to_pfn(phys), mk_pud_sect_prot(prot)); |
15122ee2 | 959 | |
82034c23 LA |
960 | /* Only allow permission changes for now */ |
961 | if (!pgattr_change_is_safe(READ_ONCE(pud_val(*pudp)), | |
962 | pud_val(new_pud))) | |
15122ee2 WD |
963 | return 0; |
964 | ||
87dedf7c | 965 | VM_BUG_ON(phys & ~PUD_MASK); |
82034c23 | 966 | set_pud(pudp, new_pud); |
324420bf AB |
967 | return 1; |
968 | } | |
969 | ||
20a004e7 | 970 | int pmd_set_huge(pmd_t *pmdp, phys_addr_t phys, pgprot_t prot) |
324420bf | 971 | { |
f7f0097a | 972 | pmd_t new_pmd = pfn_pmd(__phys_to_pfn(phys), mk_pmd_sect_prot(prot)); |
15122ee2 | 973 | |
82034c23 LA |
974 | /* Only allow permission changes for now */ |
975 | if (!pgattr_change_is_safe(READ_ONCE(pmd_val(*pmdp)), | |
976 | pmd_val(new_pmd))) | |
15122ee2 WD |
977 | return 0; |
978 | ||
87dedf7c | 979 | VM_BUG_ON(phys & ~PMD_MASK); |
82034c23 | 980 | set_pmd(pmdp, new_pmd); |
324420bf AB |
981 | return 1; |
982 | } | |
983 | ||
20a004e7 | 984 | int pud_clear_huge(pud_t *pudp) |
324420bf | 985 | { |
20a004e7 | 986 | if (!pud_sect(READ_ONCE(*pudp))) |
324420bf | 987 | return 0; |
20a004e7 | 988 | pud_clear(pudp); |
324420bf AB |
989 | return 1; |
990 | } | |
991 | ||
20a004e7 | 992 | int pmd_clear_huge(pmd_t *pmdp) |
324420bf | 993 | { |
20a004e7 | 994 | if (!pmd_sect(READ_ONCE(*pmdp))) |
324420bf | 995 | return 0; |
20a004e7 | 996 | pmd_clear(pmdp); |
324420bf AB |
997 | return 1; |
998 | } | |
b6bdb751 | 999 | |
ec28bb9c | 1000 | int pmd_free_pte_page(pmd_t *pmdp, unsigned long addr) |
b6bdb751 | 1001 | { |
ec28bb9c CP |
1002 | pte_t *table; |
1003 | pmd_t pmd; | |
1004 | ||
1005 | pmd = READ_ONCE(*pmdp); | |
1006 | ||
fac880c7 | 1007 | if (!pmd_table(pmd)) { |
9c006972 | 1008 | VM_WARN_ON(1); |
ec28bb9c CP |
1009 | return 1; |
1010 | } | |
1011 | ||
1012 | table = pte_offset_kernel(pmdp, addr); | |
1013 | pmd_clear(pmdp); | |
1014 | __flush_tlb_kernel_pgtable(addr); | |
1015 | pte_free_kernel(NULL, table); | |
1016 | return 1; | |
b6bdb751 TK |
1017 | } |
1018 | ||
ec28bb9c | 1019 | int pud_free_pmd_page(pud_t *pudp, unsigned long addr) |
b6bdb751 | 1020 | { |
ec28bb9c CP |
1021 | pmd_t *table; |
1022 | pmd_t *pmdp; | |
1023 | pud_t pud; | |
1024 | unsigned long next, end; | |
1025 | ||
1026 | pud = READ_ONCE(*pudp); | |
1027 | ||
fac880c7 | 1028 | if (!pud_table(pud)) { |
9c006972 | 1029 | VM_WARN_ON(1); |
ec28bb9c CP |
1030 | return 1; |
1031 | } | |
1032 | ||
1033 | table = pmd_offset(pudp, addr); | |
1034 | pmdp = table; | |
1035 | next = addr; | |
1036 | end = addr + PUD_SIZE; | |
1037 | do { | |
1038 | pmd_free_pte_page(pmdp, next); | |
1039 | } while (pmdp++, next += PMD_SIZE, next != end); | |
1040 | ||
1041 | pud_clear(pudp); | |
1042 | __flush_tlb_kernel_pgtable(addr); | |
1043 | pmd_free(NULL, table); | |
1044 | return 1; | |
b6bdb751 | 1045 | } |
4ab21506 | 1046 | |
8e2d4340 WD |
1047 | int p4d_free_pud_page(p4d_t *p4d, unsigned long addr) |
1048 | { | |
1049 | return 0; /* Don't attempt a block mapping */ | |
1050 | } | |
1051 | ||
4ab21506 | 1052 | #ifdef CONFIG_MEMORY_HOTPLUG |
940519f0 MH |
1053 | int arch_add_memory(int nid, u64 start, u64 size, |
1054 | struct mhp_restrictions *restrictions) | |
4ab21506 RM |
1055 | { |
1056 | int flags = 0; | |
1057 | ||
1058 | if (rodata_full || debug_pagealloc_enabled()) | |
1059 | flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; | |
1060 | ||
1061 | __create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start), | |
475ba3fc | 1062 | size, PAGE_KERNEL, __pgd_pgtable_alloc, flags); |
4ab21506 RM |
1063 | |
1064 | return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, | |
940519f0 | 1065 | restrictions); |
4ab21506 | 1066 | } |
22eb6346 DH |
1067 | void arch_remove_memory(int nid, u64 start, u64 size, |
1068 | struct vmem_altmap *altmap) | |
1069 | { | |
1070 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1071 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1072 | struct zone *zone; | |
1073 | ||
1074 | /* | |
1075 | * FIXME: Cleanup page tables (also in arch_add_memory() in case | |
1076 | * adding fails). Until then, this function should only be used | |
1077 | * during memory hotplug (adding memory), not for memory | |
1078 | * unplug. ARCH_ENABLE_MEMORY_HOTREMOVE must not be | |
1079 | * unlocked yet. | |
1080 | */ | |
1081 | zone = page_zone(pfn_to_page(start_pfn)); | |
1082 | __remove_pages(zone, start_pfn, nr_pages, altmap); | |
1083 | } | |
1084 | #endif |